Discharge tube



C. BOL ET AL Feb. 4, 1930.

DI SCHARGE TUB E Filed Jan. 23, 1926 Patented Feb. 4, 1930 UNITED STATES PATENT OFFICE CORNELIS BOL AND BALTHASAR VAN DER POL, EINDHOVEN, NETHERLANDS, AS-

SIGNORS, BY MESNE ASSIGNMENTS, TO RADIO CORPORATION OF AMERICA, OF NEW YORK, N.`Y., A CORPORATION OF NEW YORK DISCHARGE TUBE Application led January 23, 1926, Serial N o. 83,293, and in the Netherlands April 18, 1925.

This invention relates to the type of discharge tubes the outer wall of which, at least partly, is constituted by one of the electrodes which for the sake of a rapid dissipation of heat is placed in a cooling vessel through which a cooling agent is caused to circulate.

The invention more particularly is concerned with the connection between the electrode to be cooled and the cooling vessel and consists in that the cooling vessel is closed by a iiange or collar of the electrode to be cooled, which flange is pressed against the open side of the cooling vessel by means of a connection one part of which is fixed to the electrode whereas the other part traverses the wall of the cooling vessel.

According to the invention the arrangement should preferably be such that the part of the connection which traverses the wall of the cooling vessel, freely passes through .an internally screw threaded bore provided 1n said wall.

The accompanying drawing diagrammatically represents, by way of example, a construction according to the invention. In this drawing:

Figure 1 represents a transmissionvvalve placed in the cooling vessel pertaining thereto.

Figure 2 shows a tap bolt with the aid. o which, if desired, the valve can be removed from the vessel.

The transmission valve represented in Figure 1, has a cylindrical metal anode 1 which is sealed to a glass vessel 10. At some distance from the seal the anode is provided with a ange 2 which with the interposition of a ring 3 of rubber or other packing ma terial is pressed against an interior flange 4 of alcylindrical metal cooling vessel 5, which in the constructionillustrated is effected with the aid of a screw threaded stud 6 fixed to the bottom of the anode 1, and of a nut 7 fitting around said stud and provided outside the cooling vessel with a head 8. In the bottom of the cooling vessel 5 is provided a bore 9 with internal screw threads through which the nut 7 freely passes but which has a smaller diameter than the head 8 so that 5 when the nut is turned on, the outer edge of the head is pressed, with the interposition `of a packing ring 11, against the bottom of the vessel 5.

If the discharge tube has to be removed from the cooling vessel, the nut 7 must be entirely unscrewed. It may, however, easily occur that the packing ring 3 sticks fast to the fiange so that it is desirable to exercise some pressure against the bottom of the metal anode because it is not advisable to exert some force either on the glass envelope 10 or on the anode immediately below the seal. This may then very easily be effected by screwing, instead of the nut 7, a tap bolt shown in Fig. 2 into the threaded hole 9. This bolt will then press against the stud 6 or, if the tap bolt has an axial bore of sufficient Width, against the bottom of the anode 1 and will raise the ange from its seat. An example of the tap bolt as above mentioned is represented in Figure 2 of the drawing.

What we claim is:

1. In electron discharge tubes an electrode forming a portion of the enclosing shell of said tube and a vessel spaced from and adapted to surround said electrode to provide a chamber for passage of cooling Huid, said electrode having a shoulder near one end adapted to engage said vessel and a screwthreaded member at the other end of the electrode, and cooperating screw-threaded means at the adjoining end of said vessel, said cooperating screwthreaded means being adapted to force the shell against the adjacent portion of the shoulder.

2. A. cooled-electrode discharge tube comlprising an exposed electrode having a ange and a projecting threaded stud, a vessel adapted to t over said electrode, a ange on said vessel adapted to engage the iange on the electrode, and screw threaded means on said vessel engaging said stud thereby securing the vessel over the electrode and forcing the vessel against the fiange.

3. A cooled-electrode discharge tube comprising an exposed electrode having a ange and a projecting threaded stud, a vessel adapted to tit over said electrode, a ange on said vessel adapted to engage the ange on the electrode, an opening in one end of the vessel,-

and aV headed nut passin thru said openin and engaging the stud ont eelectrode, the hea of said nut securing the vessel in lace over the electrode and forcing said anges to- 5 gether.

4. A cooled-electrode dlscharge tube comrising an exposed electrode having a pro- ]ecting threaded stud, a vessel adapted to iit over said electrode, an opening in one end 'of the vessel, a headed nut passing thru said opening and engaging the stud on the electrode, the head of said nut securing the vessel in place over the electrode, and packing between the nut head and the vessel.

5. A cooled-electrode discharge tube comprising an exposed electrode having a ilange and a projecting threaded stud, a vessel adapted to fit over said electrode, a iiange on said vessel adapted to engage the Bange on the electrode, an opening in one end of the vessel, a headed nut passing thru said opening and engaging the stud on the elec trede, the head of said nut securing the vessel in place over the electrode and forcing said anges together, and packing between the nut head and the vessel, and said opening in thevessel being screw threaded for a nut to force the vessel from the electrode when the vessel is to be removed.

In testimony whereof we afiix our signatures at the city of Eindhoven, this 24th day of December, A. D. 1925.

CORNELIS BOL. BALTHASAR VAN DER POL. 

